* Execute at least one step when window has no focus
This way if `core.redraw` is set, it's respected.
* Fully run threads at least once when window has no focus
This allows threads that set `core.redraw` (like `projectsearch`) to
continue running even after the window loses focus.
"Fully" here means that `run_threads` has gone through *all* the "timed
out" coroutines at least once.
Guldomanandtakase1121
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